Understanding Paramagnetic Material Behavior at High Temperatures
This question asks about the conditions under which paramagnetic materials exhibit behavior similar to diamagnetic materials. Let's break down the concepts of paramagnetism, diamagnetism, and how temperature affects them.
Paramagnetic Materials Explained
Paramagnetic materials are substances that are weakly attracted by an external magnetic field. They have unpaired electrons, and these electrons' magnetic moments tend to align with the applied field, creating a net magnetization in the same direction as the field. However, this effect is temporary and disappears when the external field is removed.
Diamagnetic Materials Explained
Diamagnetic materials are substances that are weakly repelled by an external magnetic field. This property arises from the orbital motion of electrons within the atoms. When an external magnetic field is applied, it induces electron orbital currents that create a magnetic field opposing the applied field. This effect is present in all materials but is usually masked by stronger paramagnetic or ferromagnetic effects.
The Role of Temperature
Temperature plays a crucial role in the magnetic behavior of materials.
- For paramagnetic materials, increasing temperature increases the thermal agitation of the atoms. This agitation makes it harder for the electron magnetic moments to align with the external magnetic field. Consequently, the magnetic susceptibility of paramagnetic materials decreases as temperature increases. This relationship is described by Curie's Law:
$ \chi = \frac{C}{T} $
where:- $ \chi $ is the magnetic susceptibility
- $ C $ is the Curie constant (specific to the material)
- $ T $ is the absolute temperature
- For diamagnetic materials, the magnetic susceptibility ($ \chi $) is negative and very small. Importantly, this susceptibility is largely independent of temperature.
Behavior at Very High Temperatures
When a paramagnetic material is subjected to very high temperatures, the thermal energy significantly disrupts the alignment of atomic magnetic moments with any external magnetic field. According to Curie's Law ($ \chi = \frac{C}{T} $), as $ T $ increases towards infinity, the susceptibility $ \chi $ approaches 0. While diamagnetic materials have a negative susceptibility, the susceptibility of paramagnetic materials at extremely high temperatures becomes very close to zero. This near-zero susceptibility means the material interacts very weakly with the magnetic field, losing its distinct paramagnetic attraction. In this state of minimal magnetic response, its behavior can be considered *analogous* or *similar* to that of diamagnetic materials, which also exhibit weak magnetic interactions (though diamagnetism is a repulsive force, characterized by a negative susceptibility).
Conclusion
Therefore, paramagnetic materials show a significantly reduced magnetic response, approximating the weak interaction characteristic of diamagnetism, when subjected to very high temperatures.
Important Questions from Chemistry (CUET PG) Mixed
- Arrange the following coal types in the increasing order of their heat content (KJ/kg)
(A). Peat
(B). Lignite
(C). Anthracite
(D). Bituminous
(E) Sub-bituminous
Choose the correct answer from the options given below: - In which of the following layers of atmosphere, does the temperature decrease with the increase in height from the earth's surafce?
(A). Troposphere
(B). Mesosphere
(C). Thermosphere
(D). Stratosphere
Choose the correct answer from the options given below: Choose the correct statement from the following:
(A). Water has highest density at 4°C
(B). Freezing point of water is 0°C
(C) An Ice cube does not completely dip in water, rather floats on water in a glass.
(D). Addition of common salt reduces freezing point of water.
Choose the correct answer from the options given below:- The number of atoms per unit cell of SCC are:
Which of the following statements are correct:
A. In SC structure $a =2r$
B. In SC structure $a =r/2$
C. In BCC structure $a = 4r/\sqrt{3}$.
D. In FCC structure $a = 2\sqrt{2} r$
Where $a$ is a lattice parameter and $r$ is the atomic radius.
